File in-use by "another user", but file isn't open.

When opening this Word document, it pops up with that File in-use message. Locked by "another user".
But it not open by anybody else.
Sometimes this message doesn't even comes up, it just opens the file with (Read-Only).
The user has full rights to the file. User is running Windows 2000 sp4 and Office 2000 sp3.
How can I fix this?

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